At least 50 protestors were also wounded in the capital and at least six towns in the south and north, with government forces, backed by army tanks and armored vehicles, deployed along main roads.
In Sanaa, an intelligence officer and an anti-riot policeman were killed and 10 protestors injured in an exchange of fire during attempts to disperse a demonstration in the Tahez neighborhood, witnesses said.
Four protestors were killed and 10 others wounded in the town of Al-Dali, 250 kilometers (155 miles) south of the capital.
One protestor was killed in the southern town of Demneh.
Three protestors were killed and seven wounded in riots in the western city of Al-Hadida, located on the Red Sea, and 15 more protestors were wounded in the southern town of Ibb.
And two protestors were killed and eight others wounded in the northern city of Saada when angry protestors tried to storm the headquarters of the ruling General Popular Congress Party, the government oil company and a state bank.
A police car was burnt by protestors in the center of the city.
An exchange of fire also occurred during demonstrations in which protestors damaged vehicles and shops in the town of Loder, in the southern province of Abyan, they said. There were no reports of casualties.
Yemeni army and security forces have been heavily deployed in Sanaa and other major towns in the south where similar clashes broke out on Wednesday during demonstrations that left at least 10 dead and scores wounded.
Tanks and armored vehicles took up positions on main crossroads in the capital and other towns as patrols roamed main streets, witnesses said.
In Sanaa, loudspeakers mounted on police cars called on residents not to take part in “destructive acts and riots” as “the security and stability of the country is the responsibility of all citizens.”
A number of journalists working for foreign television told AFP the Yemeni information ministry has banned them from airing footage from the violence via satellite transmission.
The violence prompted the US embassy in Sanaa to announce in a warden message on Wednesday that “it has advised embassy personnel to avoid non-essential travel within Yemen over the next week, July 20-July 27.”
“The Embassy security office has received reports of isolated incidents of rock throwing and gatherings throughout the country protesting recently announced price increases,” it said.
The Yemeni cabinet announced late Tuesday that it would put into effect new fuel prices, as it decided to lift its subsidies to fuel products.
Petrol prices in the impoverished republic nearly doubled from 35 riyals (32 cents) per litre to 65 riyals (60 cents). Diesel jumped from 17 riyals (16 cents) to 45 riyals (42 cents).
“The cabinet has reached a conclusion ...To continue subsidising fuel products consumed locally would lead eventually to an increse in budget deficit ... and put pressure on exchange rate and prices,” a cabinet statement said.
